The limited-edition Porsche Carrera GT that Paul Walker and Roger Rodas crashed in was an unusually powerful and intricately designed sports car – and one of Rodas's favorites, an auto technician who maintained and rode in the car tells PEOPLE exclusively.

Jason Doornick, 25, who serviced the high-performance vehicles at Always Evolving, Rodas's custom car shop in Valencia, Calif., says he conducted a 350-point inspection of the 2005 Porsche a couple of weeks before the single-car wreck that killed both men. He says the car had only a few thousand miles on it and seemed fine.

"As far as I know, I was the last one to touch it," Doornick tells PEOPLE.

It's no secret that the cast of the Fast & Furious franchise was extremely close, as was reflected in the on-screen chemistry that helped make the action series so successful.

This, too, is what no doubt accounts for making this Paul Walker tribute video, which the franchise released on its official YouTube channel Wednesday, so affecting.

Set to "Coming Home" by P.Diddy, and running slightly more than two minutes, the video is neither maudlin nor overwrought. It's simple, artful and genuine – which is exactly why it's the perfect tribute to Walker.

"He told me recently he was the happiest he'd ever been," close friend Brandon Birtell tells PEOPLE. "It was directly because of the growing relationship with his daughter and the clarity that brought to his life."

Paul Walker, who died in a car crash on Saturday afternoon in Valencia, Calif., was best known for his roles in The Fast and the Furious films, but there were so many in Hollywood who knew him as more than the franchise's Brian O'Conner.

Friends and colleagues flooded Twitter with tributes to the father of one, who got his start as a child actor in commercials and went on to make appearances in shows like Charles in Charge, Who's the Boss and The Young and the Restless.

"My heart is hurting so bad no one can make me believe this is real," his friend and costar Tyrese posted on Instagram.

Hours after the fiery car crash that killed Paul Walker, the 40-year-old star of the Fast and Furious movie franchise, and another man, details from eye witnesses and police have emerged to show that the accident occurred during a charity car show that went horribly wrong.

"We were collecting toys for the Indiana tornado victims and the Philippine [typhoon] victims," says Jim Torp, who attended the event held by Always Evolving, a Valencia, Calif.-based automotive company. "There were dozens of high-end race cars and custom-built cars on display."

As the car show was winding down, Walker, whose 15-year-old daughter Meadow Rain also was at the event, got into a red 2005 Porsche Carrera GT with the car's driver, Always Evolving owner Roger Rodas.